莫拉克台风荖浓溪坡地灾害调查.PDF

地工技術，第122期 (2009年12月)第13-20頁 Sino-Geotechnics, No.122 (Dec.,2009) pp.13-20 莫拉克颱風荖濃溪坡地災害調查 陳天健 吳嘉俊 翁孟嘉 謝坤宏 王建智 屏東科技大學 高雄大學 正修科技大學 摘 要 荖濃溪為高屏溪主要支流之一，莫拉克颱風(Morakot)為2009年編號第8號之颱風，莫拉克颱風 於本地區超過3000mm之雨量，最大時雨量超過 100mm/hr ，造成本溪流域內嚴重坡地災害。由初 步災害調查中顯示，莫拉克颱風帶來之鉅量累積雨量且長時間連續強降雨特性，對荖濃溪之嚴重的 崩塌及土石流災害與有顯著之影響；除豪雨外造成災害之因素，尚包括：迎風面、順向坡構造、居 住於堆積扇、緊鄰山坡缺乏緩衝空間、崩塌擠壓造成河流擺盪、及嚴重土石流等因素，交織成變臉 的荖濃溪。 關鍵字：莫拉克颱風、坡地災害。 Slope Failure of Lawnon Basin Induced by Typhoon Morakot Tien-Chien Chen Chia-Chun Wu Meng-Chia Weng National Pingtung University of Science and Technology National Kaohsiung University Kun-Hung Hsieh Chien-Chin Wang Cheng Shiu University Abstract Lawnon River, the major branch of Kaoping River, was damaged by Typhoon Morakot which inducing the accumulation precipitation more than 3000mm and up to 100 mm/hr in intensity. A reconnaissance was conducted shown the severe slope failure and debris flows of Lawnon basin were related to the huge rain accumulation and long duration of intense precipitation by the typhoon. Besides, the topography and geology are enhanced the hazard of disaster, such as slope aspect in windward sides, dip slope topography, residents lived in deposition fan, lacked of buffer zone, river swing caused by dammed, and severe debris flow, inducing a face-off of basin environment. Key Words ：Typhoon Morakot, Slope disaster. 半徑達250公里、十級暴風圈半徑達 100公里。當 一、前 言 莫拉克颱風逐漸接近台灣本島時，前進速度逐漸